Southern Sheeting Supplies

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Southern Sheeting Supplies, Industrial, Agricultural, Domestic

Fixings and Fasteners

The most commonly used fastener for speed of erection is the self-drilling, self-tapping screw which incorporates and integral drill point for fixing in one operation with a power tool. Manufactured from either carbon steel or stainless steel the fastener heads either have an integral colour head or separate press-fit colour cap to match the colour of the cladding.

The majority of box profile single skin sheeting systems are fastened through the bottom corrugation of the sheet. An EPDM bonded aluminium washer accompanies the screw which will insure a weathertight fixing if correctly tightened.

Different types of fixings will need to be used depending on the material that the fixing is expected to drill through, here are the most common fixing types and what they are capable of drilling through:

Woodtek drillscrews - This fixing will self screw through steel sheeting and have a course thread to keep a firm hold in the timber structure. When fixing single skin sheeting a 45mm long woodtek fixing is recommended where enough timber is available to fix into. Available from 25mm - 200mm long.

Light Section drill screws - This fixing will self screw through up to 3mm thick steel and is ideal when fixing sheeting to cold rolled purlins. A 25mm long light section is recommended when fixing single skin sheeting into purlins. Available from 25mm - 200mm long.

Heavy Duty drillscrews - Using its own cutting tip of about 15mm long, this type of fixing will self screw through up to 12mm thick steel. Ideal for use when fixing to angle iron, a 38mm long screw is recommended for single skin sheeting. Available from 38mm - 200mm long.

Stitcher drillscrews - When fixing two single skin sheets together, either on a side lap or when attaching flashings to sheeting a stitcher screw should be used. These are manufactured at around 22mm long with a course thread to stitch the two sheets together. One size only.

Laplocks - These high quality fasteners are ideal for stitching applications on translucent rooflights and for bargeboards, ridge cappings and closures in fibre cement roof systems. The material being joined should be predrilled with a 9.5mm drill bit, the laplock fastener is then inserted and tightened. The EPDM sleeve around the stainless steel bolt will expand to provide a clamping action while still allowing expansion and contraction of the sheet material. They are manufactured with either a domed sealer washer for corrugated profiles or with a flat bonded aluminium washer for trapezoidal sheeting.

Baz fixings - Are a self drilling screw purposely designed to fix fibre cement (or asbestos cement) profiled sheeting to purlins or rails. They are a fast method for fixing these sheets as the fixer can operate safely from above the sheet, as apposed to the traditional hookbolt which will often requires two fixers (one above and one below the sheeting). The Baz fixing comes complete with its own wings to drill the correct clearance hole to allow for expansion and contraction, and also includes a domed sealer washer for water tightness around corrugated profiles. Baz fixings are available with different cutting edges and threads depending on the material they are fixing into, and different lengths depending on the profile depth of the sheet being fixed.

Ruff-Nex - Ruff-Nex anchors provide a simple, one piece method of fastening batterns, brackets, cladding rails and other building components to masonry. The fastener is driven into predrilled hole and the hardened, special thread forms cuts into the masonry, providing a high pullout strength in structural concrete, hollow block, brick and other masonry materials. Available from 32mm to 152mm long.

Springhead nails- A Galvanised spring head nails are most commonly used for securing corrugated sheeting and are always Galvanised. They absorb movement in the structure and the convex washer covers the hole made by the nail. These are usually sold with a plastic spat washer

Roof Sheeting - Minimum 19mm diameter washer

Wall Cladding - Minimum 16mm diameter washer

Translucent Sheeting - Minimum 26mm diameter

For composite panel systems a special self-spacing screw has been designed to prevent compression of the insulation foam and it is important that these are used. This type of screw has a second thread immediately beneath the washer head which engages with the external profiled sheet thickness and ensures correct compression of the sealing washer. Local damage to the panel is thus prevented during fixing and with on-going foot traffic.